The Role of Radical Surgery in the Management of Acquired Uterine Arteriovenous Malformation

BACKGROUND Acquired arteriovenous malformations (AVMs) can develop after uterine instrumentation. The increased risks of vascular changes, including abnormal placentation, after repeated cesarean sections are well studied. Herein, we describe a patient with delayed hemorrhage from a uterine AVM, following dilation and curettage for a cesarean scar pregnancy. CASE A 32-year-old G3P2 presented with a cesarean scar ectopic pregnancy managed with dilation and curettage, which incurred a 1,500-ml blood loss. Within 6 weeks, she returned with 2 episodes of vaginal bleeding. Initial angiography demonstrated a high-flow arteriovenous fistula, which was coiled. Vaginal hemorrhage recurred; repeat angiography demonstrated a large AVM. Gelfoam embolization of the bilateral internal iliac arteries reduced the vascularity of the AVM. The AVM's location, starting at the left lateral apex of the cesarean scar and extending into the parametrium, necessitated a radical hysterectomy. Pathologic examination revealed a placenta percreta extending into the parametrium. CONCLUSION The prevalence of uterine AVMs has increased with the rise in surgical obstetrics. In patients with a failed prior interventional procedure, surgical management is necessary to prevent life-threatening hemorrhage. The location of the AVM within the abnormal uterine scar tissue requires familiarity with radical pelvic surgical techniques that are normally used in cancer surgery in order to definitively treat this delayed obstetrical complication.